Memory Leak in tcp_bpf_sendmsg in Kernel
Summary
GSD-2022-1001834: bpf, sockmap: Fix memleak in tcp_bpf_sendmsg while sk msg is full. Affects Kernel versions >= 604326b41a6fb9b4a78b6179335decee0365cd8c, < de3a8d8fab0710186f7864ec812836d8d70da3c9. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that manages core system functions and provides an interface between hardware and software. It is responsible for memory management, process scheduling, device drivers, and other critical tasks. The tcp_bpf_sendmsg function is part of the Kernel's networking subsystem and is used for sending messages over TCP sockets. However, a memory leak vulnerability has been discovered in tcp_bpf_sendmsg when the socket message (sk msg) is full.
Vulnerability Detail
The memory leak vulnerability in tcp_bpf_sendmsg occurs when the sk msg is full, leading to a continuous allocation of memory without proper deallocation. This can result in memory exhaustion and potential denial-of-service (DoS) conditions. An attacker could exploit this vulnerability by repeatedly sending messages to a TCP socket, causing the system to run out of memory and become unresponsive. The vulnerability was introduced in version v4.20 of the Linux Kernel and has been fixed in version v5.15.33.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can limit the impact of this vulnerability by implementing rate limiting or throttling mechanisms for incoming messages on TCP sockets. By controlling the rate at which messages are received, the risk of memory exhaustion can be mitigated. Here is an example of how to implement rate limiting using the iptables firewall:
iptables -A INPUT -p tcp --syn --dport <port_number> -m limit --limit <limit_rate> -j ACCEPT
iptables -A INPUT -p tcp --syn --dport <port_number> -j DROP
This iptables rule limits the rate of incoming TCP SYN packets on a specific port, allowing only a certain number of packets per second. Exceeding the limit will result in the packets being dropped.
Conclusion
In conclusion, the memory leak vulnerability in tcp_bpf_sendmsg can lead to memory exhaustion and potential denial-of-service conditions. It is crucial to update the Linux Kernel to version v5.15.33 or later to fix this vulnerability. Additionally, implementing rate limiting or throttling mechanisms for incoming messages on TCP sockets can help mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The memory leak vulnerability in tcp_bpf_sendmsg can lead to memory exhaustion and potential denial-of-service (DoS) conditions. An attacker could exploit this vulnerability to cause the system to run out of memory and become unresponsive.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any open-source vulnerabilities, including this memory leak issue in tcp_bpf_sendmsg.
Yes, the memory leak vulnerability in tcp_bpf_sendmsg has been fixed in Linux Kernel version v5.15.33. It is recommended to update your Kernel to this version or later to ensure the vulnerability is addressed.
At the time of this report, there are no known exploits for this vulnerability. However, it is important to apply the necessary updates and security patches to mitigate the risk of potential exploitation.
While it is highly recommended to update the Kernel to the fixed version, you can implement rate limiting or throttling mechanisms for incoming messages on TCP sockets as a temporary mitigation. By controlling the rate at which messages are received, the risk of memory exhaustion can be reduced.
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